固体酸催化剂脱附活化能动力学模型研究及酸强度表征  

Study on kinetic model for desorption activation energy of solid acids and characterization of their acidity

作　　者：任杰[1] 陆文娟[1] 黄国文[1] 

机构地区：[1]浙江工业大学化工与材料学院,浙江杭州310014

出　　处：《工业催化》2006年第5期65-68,共4页Industrial Catalysis

基　　金：浙江省自然科学基金项目(20010148)

摘　　要：基于脱附动力学,确定了脱附活化能动力学模型方程,建立了基于一套程序升温脱附(TPD)数据确定固体酸催化剂脱附活化能的动力学模拟方法。不同温度活化的催化剂TPD实验数据模拟计算结果指出,催化剂的脱附过程符合2级脱附规律;随着活化温度的提高,催化剂的脱附活化能(或酸强度)呈先增大后降低的变化趋势。比较单套数据法和多套数据法的计算结果可知,两种方法测定的脱附级数相同,各活化催化剂的脱附活化能有相似的变化趋势,单套数据法具有操作简便和结果可靠的优点。The kinetic model for desorption activation energy of solid acids was determined. A new simulation method for determination of desorption activation energy over solid acid catalysts from temperature programmed desorption（TPD） results was established. The results showed that the TPD pro- cess fits well with second-order desorption mechanism, and the activation energy for the desorption （acidity） first increased and then declined with activation temperature of the catalyst. The same adsorption order and trends in desorption activation energy over different catalysts were seen betwcen kinetic model from single group of TPD data and multi-groups of TPD data. The kinetic model from single group of TPD data is simpler and more reliable.

关 键 词：固体酸催化剂 脱附活化能 表面酸强度 程序升温脱附 动力学模型 

分 类 号：TQ013.2[化学工程] O643.1[理学—物理化学]